[目的]研究砜吡草唑与二甲戊灵混配对棉田阔叶杂草的防除效果，并评价其安全性。[方法]设置40%砜吡草唑SC和330 g/L二甲戊灵EC混配田间药效试验，评价各处理对棉田龙葵、灰绿藜、反枝苋、马齿苋和苘麻等阔叶杂草的防效及其对棉花生产的安全性。[结果]各处理棉花出苗率为 80。56%～83。61%，与对照相比差异未达显著水平。砜吡草唑SC 120、180 和 240 g a。i。/hm2 分别与 330 g/L二甲戊灵EC 742。5 g a。i。/hm2混配后，药后30d对棉田阔叶杂草的株防效分别为89。15%、92。03%和97。83%，药后45d株防效分别为87。94%、91。49%和95。56%，鲜重防效分别为90。80%、93。16%和95。65%，混配药剂对棉田阔叶杂草的株防效和鲜重防效均优于单剂处理。各供试处理与对照相比，棉花增产幅度达 9。89%～16。45%。[结论]40%砜吡草唑SC 120～180 g a。i。/hm2与330 g/L二甲戊灵EC混配可用作棉花田防除阔叶杂草，对棉花出苗安全。
Control effect of pyroxasulfone mixed with pendimethalin on broadleaf weeds in cotton filed and its safety evaluation
[Objective]To confirm the control effect on the mixture of Pyroxasulfone and Pendimethalin to broadleaf weeds in cotton field.[Methods]Field trials were set up with mixture of 40%Pyroxasulfone SC and 330 g/L Pendimethalin EC to evaluate its safety to cotton and control effect on broadleaf weeds,such as Solanum nigrum,Chenopodium glaucum,Amaranthus retroflexus,Portulaca oleracea,Abutilon theophrasti.[Results]The results showed that germination rate of cotton was 80.56%-83.61%in treatment of mixed herbicides,there were no significant differences between treatment and contrast.The dosage of 330 g a.i./L Pendimethalin EC 742.5 g a.i./hm2 were mixed with Pyroxasulfone SC 120,180 and 240 g a.i./hm2 respec-tively,and their control effects of plant to broadleaf weeds were 89.15%,92.03%and 97.83%after 30 days and 87.94%,91.49%and 95.56%after 45 days,the control effects of fresh weigh to broadleaf weeds were 90.80%,93.16%and 95.65%respectively,the compound-dose treatments were more efficient than single-dose treatments on control effects of plant and fresh weight to broadleaf weeds.The yield of each treatment increased9.89%-16.45%compared with control.[Conclusion]40%Pyroxasulfone SC 120-180g a.i./hm2 mixed with 330 g/L Pendimethalin EC are effective to control broadleaf weeds in cotton filed and safe to cotton.
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